[Tile-serving] [openstreetmap/osm2pgsql] Draft bucket index (#1271)

[Jochen Topf]

This is a draft PR of an improved version of PR #1058. This now allows both the old and the new index to be created/used. Also adds some documentation.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/1271

-- Commit Summary --

  * Draft: Reduced way node index

-- File Changes --

    A docs/bucket-index.md (79)
    M src/middle-pgsql.cpp (59)
    M src/options.cpp (37)
    M src/options.hpp (9)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/1271.patch
https://github.com/openstreetmap/osm2pgsql/pull/1271.diff

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